A heat transfer label printer

Abstract

The present application relates to wood printer technical field, disclose a kind of heat transfer label printer, including portable heat transfer label printer body and the paper cabin room opened inside, paper cabin cover is rotatably installed on paper cabin room upper.The present application drives positioning roller to rotate to the inside of paper cabin room, the notch on the rotating disc is automatically corresponding with the top block at the center axis of paper cabin cover, so as to unlock paper cabin cover, the whole process does not need additional manual unlocking operation, greatly shorten the paper roll replacement time, improve overall printing efficiency;And when positioning roller rotates to the inside of paper cabin room, synchronous lever and the guide plate of paper cabin room side wall are separated, under the action of reset spring, synchronous lever drives the outer expansion plate of positioning roller side wall to move outward on one side, so that the outer expansion plate is attached with the inner cavity of paper roll to realize positioning, on the other hand, synchronous lever moves downward and extrudes the liquid in the inside of positioning roller, drives the elastic cloth bag at the top of positioning roller to swell, the swollen elastic cloth bag is contacted with the end of paper roll to limit the position of paper roll end, form double positioning.

Description

Technical Field

[0001] This invention belongs to the field of wood printer technology, specifically, it relates to a thermal transfer label printer. Background Technology

[0002] A thermal transfer label printer is a specialized device that uses "heat transfer" technology to print labels. With its advantages of high print clarity, durable labels, and wide material compatibility, it is widely used in various fields such as industry, commerce, medical, and logistics, becoming one of the core devices for label production. Its core feature is the precise transfer of ink or coating from a ribbon to the surface of the substrate using controlled heat, forming durable, scratch-resistant markings or text.

[0003] However, the paper compartment structure of traditional thermal transfer label printers is relatively cumbersome. When installing the paper roll, the paper compartment cover must be opened first through a separate unlocking mechanism, and then the paper roll position must be manually adjusted to align it with the printing mechanism. The whole process involves multiple independent operations. Not only do operators need to repeatedly calibrate the paper roll posture, but they also need to perform the additional unlocking action of the cover, which makes the paper roll replacement process complicated and time-consuming. Furthermore, some rely solely on the axial limitation of the paper compartment side baffle, which is prone to axial movement of the paper roll due to poor fit. In addition, most rely on the gap fit between the paper roll and the positioning component to achieve radial positioning. When the inner diameter of the paper roll deviates or printing force is applied, radial displacement is prone to occur, which in turn causes label printing misalignment, reduced clarity, and affects print quality.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0006] A thermal transfer label printer includes a portable thermal transfer label printer body and a paper compartment opened inside, with a paper compartment cover rotatably mounted on the paper compartment.

[0007] A limiting plate is rotatably installed on the side wall of the paper compartment, and a positioning roller is rotatably installed on the limiting plate. When the positioning roller and the limiting plate are in a vertical state, it is convenient to install the paper roll. A turntable is installed at the rotation center of the limiting plate. The turntable has a notch and is in contact with the central axis of the paper compartment cover. A top block is installed on the central axis of the paper compartment cover and is in contact with the side wall of the turntable for positioning the paper compartment cover. When the positioning roller rotates into the paper compartment, the top block corresponds to the notch, and the paper compartment cover is unlocked.

[0008] A synchronizing rod is vertically inserted inside the positioning roller, and a return spring is installed between the two. The synchronizing rod is in contact with a guide plate installed on the side wall of the paper compartment. An outer expansion plate is inserted into the side wall of the positioning roller. When the positioning roller rotates into the paper compartment, the synchronizing rod separates from the guide plate, and the synchronizing rod drives the outer expansion plate to move outward and position the inner cavity of the paper roll. An elastic cloth bag is provided on the top of the positioning roller. The synchronizing rod moves down and squeezes the liquid inside the positioning roller, causing the elastic cloth bag to expand and limit the position of the end of the paper roll.

[0009] In a preferred embodiment of the present invention, the portable thermal transfer label printer body has a protrusion on its surface, the protrusion being arc-shaped, a handle is installed on the side wall of the portable thermal transfer label printer body, the handle surface is knurled, and an anti-slip pad is installed on the bottom of the portable thermal transfer label printer body.

[0010] In a preferred embodiment of the present invention, a positioning shaft is welded to the rotation center of the paper compartment cover. The two ends of the positioning shaft are rotatably connected to the inner side wall of the paper compartment. A torsion spring is sleeved on the positioning shaft. One end of the torsion spring is engaged with the inner side wall of the paper compartment, and the other end of the torsion spring is engaged with the end of the paper compartment cover. The positioning shaft is connected to the top block, and the side wall of the positioning shaft is in contact with the end of the turntable.

[0011] In a preferred embodiment of the present invention, a sleeve roller is installed on the positioning roller, the sleeve roller and the limiting plate are movably connected through the synchronizing rod, the sleeve roller is movably inserted into the inner side wall of the positioning roller, a sliding groove is provided on the inner side wall of the positioning roller, and a slide rail is installed on the outer side wall of the sleeve roller, the slide rail is slidably disposed on the inner side wall of the sliding groove.

[0012] In a preferred embodiment of the present invention, a pair of connecting plates are installed at the bottom of the limiting plate, and the pair of connecting plates are placed on both sides of the synchronizing rod. A synchronizing shaft is installed at the rotation center of the pair of connecting plates. A positioning seat is rotatably installed on the side wall of the synchronizing shaft. An mounting plate is installed at the end of the positioning seat. The mounting plate is connected to the inner side wall of the paper compartment by bolts.

[0013] In a preferred embodiment of the present invention, a retaining shaft is fixedly installed at the end of the synchronous shaft, a limiting seat is rotatably installed on the side wall of the retaining shaft, the bottom of the limiting seat is welded to the inner side wall of the paper compartment, the end of the retaining shaft is connected to the rotation center of the turntable, and the rotation direction of the turntable is perpendicular to the rotation direction of the top block.

[0014] In a preferred embodiment of the present invention, a positioning plate is installed inside the positioning roller, the positioning plate is located below the outer expansion plate, the positioning plate is movably connected to the synchronizing rod, a fixing plate is installed on the synchronizing rod, the fixing plate is located below the positioning plate, a return spring is sleeved on the synchronizing rod, one end of the return spring is engaged with the positioning plate, the other end of the return spring is engaged with the fixing plate, the return spring is in a compressed state, the return spring is used to squeeze the synchronizing rod to slide towards the rotation center.

[0015] In a preferred embodiment of the present invention, a connecting frame is installed on the side wall of the guide plate, the guide plate and the connecting frame form an L-shaped angle, and the guide plate is in a horizontal state. The connecting frame is connected to the mounting plate. A ball bearing is installed at the bottom of the synchronizing rod, and the bottom of the ball bearing is slidably connected to the surface of the guide plate.

[0016] In a preferred embodiment of the present invention, a plurality of pressure plates are installed on the synchronizing rod, and a rocker arm is rotatably installed at the bottom of each pressure plate. The rocker arm is in an inclined state, and an insert rod is rotatably installed at the end of the rocker arm. The insert rod moves through the side wall of the positioning roller, and the end of the insert rod is connected to the side wall of the outer expansion plate, and the outer side wall of the outer expansion plate is arc-shaped.

[0017] In a preferred embodiment of the present invention, a partition is installed on the positioning roller, and a liquid cavity is formed between the top of the partition and the bottom of the positioning roller. The liquid cavity is filled with water. The elastic cloth bag is connected to the liquid cavity. A connecting rib is installed between the positioning roller and the elastic cloth bag to improve the connection strength. A piston is slidably arranged inside the liquid cavity. The piston is used to compress water. A pull rod is installed at the center of the piston. The pull rod passes through the partition and the bottom of the pull rod is connected to a synchronizing rod.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] This invention features a vertically positioned positioning roller and a limiting plate. Operators can directly insert and mount the paper roll along the axis of the positioning roller without complex alignment steps. As the positioning roller is pushed into the paper compartment, the limiting plate rotates accordingly, causing a turntable at its center to rotate synchronously. This automatically aligns the notch on the turntable with the top block at the center axis of the paper compartment cover, unlocking the cover. The entire process requires no additional manual unlocking; the initial placement of the paper roll and unlocking of the cover are completed simultaneously through the rotation of the positioning roller, significantly reducing paper roll change time and improving overall printing efficiency. Simultaneously, it enables the paper roll to... Dual precision positioning ensures printing stability. After the positioning roller rotates into the paper compartment, the synchronizing rod separates from the guide plate on the side wall of the paper compartment. Under the action of the return spring, the synchronizing rod drives the outer expansion plate on the side wall of the positioning roller to move outward, so that the outer expansion plate fits with the inner cavity of the paper roll to achieve positioning. On the other hand, the synchronizing rod moves down to squeeze the liquid inside the positioning roller, causing the elastic bag at the top of the positioning roller to expand. The expanded elastic bag contacts the end of the paper roll to limit the position of the end of the paper roll, forming a dual positioning of the paper roll, which effectively avoids the paper roll from shifting during printing and ensures the clarity and dimensional accuracy of the label printing.

[0020] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0021] In the attached diagram:

[0022] Figure 1 A 3D model of a thermal transfer label printer;

[0023] Figure 2 This is a diagram showing the paper compartment cover of a thermal transfer label printer after it has been opened.

[0024] Figure 3 A partial view of a thermal transfer label printer Figure 1 ;

[0025] Figure 4 For a thermal transfer label printer Figure 3 Enlarged view of point A in the middle;

[0026] Figure 5 A partial view of a thermal transfer label printer Figure 2 ;

[0027] Figure 6 For a thermal transfer label printer Figure 5 Enlarged view at point B in the middle;

[0028] Figure 7 For a thermal transfer label printer Figure 5 Sectional view;

[0029] Figure 8 For a thermal transfer label printer Figure 7 Enlarged view of point C.

[0030] In the picture:

[0031] 1. Portable thermal transfer label printer body; 11. Paper compartment cover; 111. Protrusion; 112. Paper compartment; 113. Positioning shaft; 114. Torsion spring; 12. Handle;

[0032] 2. Positioning roller; 21. Sleeve roller; 211. Slide rail; 212. Slide groove; 22. Limiting plate; 221. Connecting plate; 222. Synchronous shaft; 223. Positioning seat; 224. Mounting plate; 23. Shaft retainer; 231. Limiting seat; 232. Turntable; 233. Notch; 234. Top block;

[0033] 3. Synchronizing rod; 31. Positioning plate; 311. Fixing plate; 312. Return spring; 32. Guide plate; 321. Connecting frame; 322. Ball bearing; 33. Outer expansion plate; 331. Insert rod; 332. Rocker arm; 333. Pressure plate; 34. Pull rod; 341. Piston; 342. Partition plate; 343. Liquid chamber; 344. Elastic bag; 345. Connecting rib. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention.

[0035] Example 1:

[0036] like Figures 1 to 8 As shown, a thermal transfer label printer includes a portable thermal transfer label printer body 1 and a paper compartment 112 inside, with a paper compartment cover 11 rotatably mounted on the paper compartment 112. The cooperation between the independent paper compartment 112 and the rotatable paper compartment cover 11 provides an independent storage space for paper rolls, while also facilitating operators to open and replace paper rolls, thus improving operational convenience.

[0037] A limiting plate 22 is rotatably installed on the side wall of the paper compartment 112. A positioning roller 2 is rotatably installed on the limiting plate 22. When the positioning roller 2 and the limiting plate 22 are in a vertical position, it facilitates the installation of the paper roll. A turntable 232 is installed at the rotation center of the limiting plate 22. A notch 233 is opened on the turntable 232, and the turntable 232 is in contact with the central axis of the paper compartment cover 11. A top block 234 is installed on the central axis of the paper compartment cover 11, which is in contact with the side wall of the turntable 232 for positioning the paper compartment cover 11. When the positioning roller 2 rotates into the paper compartment 112, the top block 234 corresponds to the notch 233, unlocking the paper compartment cover 11. The rotation of the positioning roller 2 is linked to the turntable 232 and the top block 234 to achieve automatic unlocking of the paper compartment cover 11, without the need for additional manual unlocking steps, simplifying the paper roll installation process. The limiting plate 22 can limit the rotation trajectory of the positioning roller 2 to ensure that the positioning roller 2 is accurately screwed into the paper compartment 112.

[0038] A synchronizing rod 3 is vertically inserted inside the positioning roller 2, and a return spring 312 is installed between the two. The synchronizing rod 3 is in contact with the guide plate 32 installed on the side wall of the paper compartment 112. An outer expansion plate 33 is inserted into the side wall of the positioning roller 2. When the positioning roller 2 rotates into the paper compartment 112, the synchronizing rod 3 separates from the guide plate 32, and the synchronizing rod 3 drives the outer expansion plate 33 to move outward and position the inner cavity of the paper roll. An elastic cloth bag 344 is provided on the top of the positioning roller 2. The synchronizing rod 3 moves down and squeezes the liquid inside the positioning roller 2, causing the elastic cloth bag 344 to expand and limit the position of the end of the paper roll. By separating and linking the synchronizing rod 3 and the guide plate 32, and combining the elastic potential energy of the return spring 312, the radial positioning of the outer expansion plate 33 on the inner cavity of the paper roll and the axial limiting of the end of the paper roll by the elastic cloth bag 344 can be realized simultaneously, forming a dual positioning structure, which effectively avoids the paper roll from shifting during printing. The guide plate 32 can support and guide the synchronizing rod 3 during the rotation of the positioning roller 2, ensuring the stability of the synchronizing rod 3.

[0039] like Figures 1 to 8 As shown in the specific embodiment, the portable thermal transfer label printer body 1 has a raised section 111 on its surface, which is arc-shaped. A handle 12 is installed on the side wall of the portable thermal transfer label printer body 1, and the surface of the handle 12 is knurled. An anti-slip pad is installed on the bottom of the portable thermal transfer label printer body 1. The arc-shaped raised section 111 enhances the anti-slip effect when the operator holds the device, the knurled handle 12 further increases the grip friction, preventing the device from slipping during use, and the bottom anti-slip pad increases stability when the device is placed, thus optimizing the overall portable user experience of the device.

[0040] like Figures 1 to 8As shown, a positioning shaft 113 is welded to the rotation center of the paper compartment cover 11. Both ends of the positioning shaft 113 are rotatably connected to the inner wall of the paper compartment 112. A torsion spring 114 is sleeved on the positioning shaft 113. One end of the torsion spring 114 is engaged with the inner wall of the paper compartment 112, and the other end is engaged with the end of the paper compartment cover 11. The positioning shaft 113 is connected to the top block 234, and the side wall of the positioning shaft 113 is in contact with the end of the turntable 232. The positioning shaft 113 provides stable support for the rotation of the paper compartment cover 11, ensuring smooth rotation. The torsion spring 114 provides elastic restoring force after the paper compartment cover 11 is unlocked, assisting the operator in quickly closing the paper compartment cover 11. Simultaneously, the contact between the positioning shaft 113 and the turntable 232 enhances the stability of the turntable 232 during rotation, ensuring precise alignment between the top block 234 and the notch 233.

[0041] Example 2:

[0042] The difference between the above embodiments and this embodiment is that: Figures 1 to 8 As shown, a sleeve roller 21 is installed on the positioning roller 2. The sleeve roller 21 and the limiting plate 22 pass through the synchronization rod 3. The sleeve roller 21 is movably inserted into the inner wall of the positioning roller 2. A groove 212 is opened on the inner wall of the positioning roller 2. A slide rail 211 is installed on the outer wall of the sleeve roller 21. The slide rail 211 is slidably disposed on the inner wall of the groove 212. During the printing process, the paper roll is smoothly unwound as the positioning roller 2 rotates. With the sleeve roller 21 sliding and adjusting within the groove 212 via the slide rail 211, the rotation of the positioning roller 2 ensures that the unwinding speed of the paper roll is synchronized with the printing speed, preventing wrinkles or tearing of the paper roll due to uneven unwinding.

[0043] like Figures 1 to 8 As shown, in a specific embodiment, a pair of connecting plates 221 are installed at the bottom of the limiting plate 22, and the pair of connecting plates 221 are positioned on both sides of the synchronizing rod 3. A synchronizing shaft 222 is installed at the rotation center of the pair of connecting plates 221. A positioning seat 223 is rotatably installed on the side wall of the synchronizing shaft 222, and an mounting plate 224 is installed at the end of the positioning seat 223. The mounting plate 224 is connected to the inner side wall of the paper compartment 112 by bolts. The pair of connecting plates 221 can support the limiting plate 22 from both sides of the synchronizing rod 3, enhancing the structural strength of the limiting plate 22. The cooperation between the synchronizing shaft 222 and the positioning seat 223 provides a stable axis for the rotation of the limiting plate 22. The mounting plate 224 is fixed by bolts to ensure that the positioning seat 223 is firmly connected to the paper compartment 112, preventing the limiting plate 22 from loosening during rotation.

[0044] like Figures 1 to 8As shown, furthermore, a retaining shaft 23 is fixedly installed at the end of the synchronous shaft 222. A limiting seat 231 is rotatably installed on the side wall of the retaining shaft 23. The bottom of the limiting seat 231 is welded to the inner side wall of the paper compartment 112. The end of the retaining shaft 23 is connected to the rotation center of the turntable 232. The rotation direction of the turntable 232 is perpendicular to the rotation direction of the top block 234. The retaining shaft 23 can accurately transmit the rotational force of the synchronous shaft 222 to the turntable 232, ensuring that the turntable 232 rotates synchronously. The limiting seat 231 provides limiting support for the retaining shaft 23, preventing the retaining shaft 23 from shifting during rotation. The design of the rotation direction of the turntable 232 perpendicular to the top block 234 makes the correspondence process between the top block 234 and the notch 233 more stable and less prone to jamming.

[0045] Example 3:

[0046] The difference between the above embodiments and this embodiment is that: Figures 1 to 8 As shown, a positioning plate 31 is installed inside the positioning roller 2, located below the outer expansion plate 33. The positioning plate 31 and the synchronizing rod 3 are movably connected. A fixing plate 311 is installed on the synchronizing rod 3, located below the positioning plate 31. A return spring 312 is sleeved on the synchronizing rod 3. One end of the return spring 312 is engaged with the positioning plate 31, and the other end is engaged with the fixing plate 311. The return spring 312 is in a compressed state and is used to compress the synchronizing rod 3 to slide towards the center of rotation. The positioning plate 31 and the fixing plate 311 cooperate to provide stable mounting support for the return spring 312, ensuring that the return spring 312 is always in a compressed state. It can quickly release elastic potential energy after the synchronizing rod 3 separates from the guide plate 32, driving the synchronizing rod 3 to slide accurately. The positioning plate 31 can also limit the sliding trajectory of the synchronizing rod 3 to prevent the synchronizing rod 3 from deviating during sliding.

[0047] like Figures 1 to 8 As shown, in a specific embodiment, a connecting frame 321 is installed on the side wall of the guide plate 32. The guide plate 32 and the connecting frame 321 form an L-shaped angle, and the guide plate 32 is in a horizontal state. The connecting frame 321 is connected to the mounting plate 224. A ball bearing 322 is installed at the bottom of the synchronizing rod 3, and the bottom of the ball bearing 322 is slidably connected to the surface of the guide plate 32. The L-shaped connecting frame 321 can stably fix the guide plate 32 on the mounting plate 224, ensuring that the guide plate 32 is in a stable horizontal state. The ball bearing 322 at the bottom of the synchronizing rod 3 can convert the sliding friction between the synchronizing rod 3 and the guide plate 32 into rolling friction, reducing component wear and extending the service life of the synchronizing rod 3 and the guide plate 32.

[0048] like Figures 1 to 8As shown, furthermore, several pairs of pressure plates 333 are installed on the synchronizing rod 3. Each pressure plate 333 has a rocker arm 332 rotatably mounted at its bottom. The rocker arm 332 is in an inclined state, and an insertion rod 331 is rotatably mounted at its end. The insertion rod 331 moves through the side wall of the positioning roller 2, and its end is connected to the side wall of the outer expansion plate 33. The outer side wall of the outer expansion plate 33 is arc-shaped. Through the linkage structure of the pressure plates 333, rocker arms 332, and insertion rods 331, the linear sliding of the synchronizing rod 3 can be converted into the radial movement of the outer expansion plate 33, achieving a tight fit between the outer expansion plate 33 and the inner cavity of the paper roll. The arc-shaped design of the outer expansion plate 33 can better fit the inner cavity of the paper roll, enhancing positioning stability. At the same time, the arrangement of several pairs of pressure plates 333 can ensure that the outer expansion plate 33 is subjected to uniform force and the outward movement process is smooth.

[0049] like Figures 1 to 8 As shown, further, a partition plate 342 is installed on the positioning roller 2, and a liquid cavity 343 is formed between the top of the partition plate 342 and the bottom of the positioning roller 2. The liquid cavity 343 is filled with water. An elastic cloth bag 344 is connected to the liquid cavity 343. A connecting rib 345 is installed between the positioning roller 2 and the elastic cloth bag 344 to improve the connection strength. A piston 341 is slidably arranged inside the liquid cavity 343. The piston 341 is used to compress water. A pull rod 34 is installed at the center of the piston 341. The pull rod 34 passes through the partition plate 342. The bottom of the pull rod 34 is connected to the synchronizing rod 3. The partition 342 can divide the interior of the positioning roller 2 into an independent liquid chamber 343, ensuring that water will not leak into other areas of the positioning roller 2. The cooperation between the piston 341 and the pull rod 34 can convert the downward force of the synchronizing rod 3 into the squeezing force on the water in the liquid chamber 343, thereby driving the elastic bag 344 to expand. The connecting rib 345 can enhance the connection strength between the elastic bag 344 and the positioning roller 2, prevent the elastic bag 344 from falling off after long-term expansion and contraction, and extend the service life of the elastic bag 344.

[0050] The implementation principle of the thermal transfer label printer of the present invention is as follows:

[0051] First, the paper roll needs to be installed in the paper compartment 112. In the initial state, the paper compartment cover 11 is locked, and the positioning roller 2 and the limiting plate 22 are vertical. At this time, the operator needs to insert the paper roll to be used directly onto the outside of the positioning roller 2 along the axial direction of the positioning roller 2, so that the paper roll is fitted around the positioning roller 2 as the center, ensuring that the paper roll initially forms a coaxial fit with the positioning roller 2.

[0052] After the paper roll and positioning roller 2 are connected, the operator pushes the positioning roller 2 to rotate towards the inside of the paper compartment 112, and the limiting plate 22 moves synchronously with the positioning roller 2. Since a pair of connecting plates 221 are installed at the bottom of the limiting plate 22, and a synchronous shaft 222 is installed at the rotation center of the pair of connecting plates 221, and the side wall of the synchronous shaft 222 is rotatably installed in the positioning seat 223, and the end of the positioning seat 223 is fixedly connected to the inner side wall of the paper compartment 112 through the mounting plate 224, the limiting plate 22 will rotate together with the synchronous shaft 222 around the rotation center of the positioning seat 223, so as to realize the smooth rotation of the positioning roller 2 into the paper compartment 112. When the synchronous shaft 222 rotates, the locking shaft 23 fixedly installed at its end will also rotate synchronously. The end of the locking shaft 23 is connected to the rotation center of the turntable 232. The turntable 232 rotates with the rotation of the locking shaft 23, so that the notch 233 on the turntable 232, which was originally misaligned with the top block 234 at the center axis of the paper compartment cover 11, gradually rotates to a position that is completely aligned with the top block 234. At this time, the locking state of the paper compartment cover 11 is released, and the operator can smoothly close the paper compartment cover 11 to complete the initial steps of paper roll installation.

[0053] As the positioning roller 2 continues to rotate to the designated position inside the paper compartment 112, the state of the vertically inserted synchronizing rod 3 inside the positioning roller 2 changes. During the rotation of the positioning roller 2, the bottom of the synchronizing rod 3 maintains sliding contact with the guide plate 32 installed on the side wall of the paper compartment 112 through the ball bearings 322. However, as the positioning roller 2 rotates, the synchronizing rod 3 gradually separates from the guide plate 32, and eventually the synchronizing rod 3 is no longer constrained by the supporting force of the guide plate 32. Since the return spring 312 sleeved on the synchronizing rod 3 is always in a compressed state, the return spring 312 releases its elastic potential energy at this time, pushing the synchronizing rod 3 to slide towards the rotation center of the positioning roller 2.

[0054] The sliding of the synchronizing rod 3 will cause several pairs of pressure plates 333 installed on its side wall to move synchronously. The rocker arm 332 connected to the bottom of the pressure plate 333 will change angle under the push of the pressure plate 333. The originally tilted rocker arm 332 will gradually rotate to the horizontal direction, thereby pushing the insertion rod 331 connected to the end of the rocker arm 332 to move outward of the positioning roller 2. The insertion rod 331 will drive the outer expansion plate 33 installed at its end to move outward synchronously. The outer expansion plate 33 will fit tightly with the inner cavity of the paper roll, realizing accurate positioning of the inner cavity of the paper roll and effectively preventing the paper roll from shifting during subsequent printing.

[0055] Simultaneously, the downward movement of the synchronizing rod 3 also affects the liquid cavity 343 inside the positioning roller 2. The bottom of the synchronizing rod 3 is connected to the top of the pull rod 34. When the synchronizing rod 3 moves downward, it drives the pull rod 34 to move downward synchronously. The piston 341 connected to the bottom of the pull rod 34 slides downward in the liquid cavity 343. The liquid cavity 343 is formed by the partition 342 inside the positioning roller 2 and the bottom of the positioning roller 2. It is filled with water and is connected to the elastic bag 344 at the top of the positioning roller 2. Finally, the piston 341 squeezes the water inside the liquid cavity 343. The squeezed water flows into the elastic bag 344 along the connecting channel, causing the elastic bag 344 to gradually expand. The connecting rib 345 installed between the positioning roller 2 and the elastic bag 344 ensures the connection strength between the two. The expanded elastic bag 344 is in close contact with the end of the paper roll, which plays a good limiting role in the end position of the paper roll, further ensuring the stability of the paper roll during the printing process and avoiding the impact of paper roll end displacement on printing accuracy.

Claims

1. A thermal transfer label printer, comprising a portable thermal transfer label printer body (1) and a paper compartment (112) opened inside, wherein a paper compartment cover (11) is rotatably mounted on the paper compartment (112), characterized in that: A limiting plate (22) is rotatably mounted on the side wall of the paper compartment (112). A positioning roller (2) is rotatably mounted on the limiting plate (22). When the positioning roller (2) is in a vertical state, it facilitates the installation of the paper roll. A turntable (232) is mounted at the rotation center of the limiting plate (22). A positioning shaft (113) is welded to the rotation center of the paper compartment cover (11). Both ends of the positioning shaft (113) are rotatably connected to the inner side wall of the paper compartment (112). The turntable (232) has a notch (233) and the turntable (232) is in contact with the positioning shaft (113) of the paper compartment cover (11). The positioning shaft (113) of the paper compartment cover (11) is equipped with a top block (234) that is in contact with the side wall of the turntable (232) for positioning the paper compartment cover (11). When the positioning roller (2) rotates into the paper compartment (112), the top block (234) corresponds to the notch (233) and the paper compartment cover (11) is unlocked. The positioning roller (2) is vertically inserted with a synchronizing rod (3), and a return spring (312) is installed between the two. The synchronizing rod (3) is in contact with the guide plate (32) installed on the side wall of the paper compartment (112). The positioning roller (2) is inserted with an expansion plate (33). When the positioning roller (2) rotates into the paper compartment (112), the synchronizing rod (3) separates from the guide plate (32). The return spring (312) in the compressed state releases its elasticity and drives the synchronizing rod (3) to slide downward. The synchronizing rod (3) drives the expansion plate (33) to move outward and positions the inner cavity of the paper roll. An elastic cloth bag (344) is provided on the top of the positioning roller (2). The synchronizing rod (3) moves down and squeezes the liquid inside the positioning roller (2), causing the elastic cloth bag (344) to expand and limit the position of the end of the paper roll. The bottom of the limiting plate (22) is equipped with a pair of connecting plates (221), and the pair of connecting plates (221) are placed on both sides of the synchronizing rod (3). The rotation center of the pair of connecting plates (221) is equipped with a synchronizing shaft (222). The end of the synchronizing shaft (222) is fixedly equipped with a retaining shaft (23). The side wall of the retaining shaft (23) is rotatably equipped with a limiting seat (231). The bottom of the limiting seat (231) is welded to the inner side wall of the paper compartment (112). The end of the retaining shaft (23) is connected to the rotation center of the turntable (232). The rotation direction of the turntable (232) is perpendicular to the rotation direction of the top block (234).

2. A thermal transfer label printer according to claim 1, characterized in that, The portable thermal transfer label printer body (1) has a protrusion (111) on its surface, the protrusion (111) is arc-shaped, the portable thermal transfer label printer body (1) has a handle (12) on its side wall, the handle (12) is knurled, and the portable thermal transfer label printer body (1) has an anti-slip pad on its bottom.

3. A thermal transfer label printer according to claim 1, characterized in that, A torsion spring (114) is sleeved on the positioning shaft (113). One end of the torsion spring (114) is engaged with the inner side wall of the paper compartment (112), and the other end of the torsion spring (114) is engaged with the end of the paper compartment cover (11). The positioning shaft (113) is connected to the top block (234), and the side wall of the positioning shaft (113) is in contact with the end of the turntable (232).

4. A thermal transfer label printer according to claim 1, characterized in that, A sleeve roller (21) is installed on the positioning roller (2). The sleeve roller (21) and the limiting plate (22) are movably connected to the synchronizing rod (3). The sleeve roller (21) is movably inserted into the inner wall of the positioning roller (2). A sliding groove (212) is opened on the inner wall of the positioning roller (2). A slide rail (211) is installed on the outer wall of the sleeve roller (21). The slide rail (211) is slidably arranged on the inner wall of the sliding groove (212).

5. A thermal transfer label printer according to claim 1, characterized in that, The synchronous shaft (222) is rotatably mounted with a positioning seat (223) on its side wall. The positioning seat (223) is mounted with an installation plate (224) at its end. The installation plate (224) is connected to the inner side wall of the paper compartment (112) by bolts.

6. A thermal transfer label printer according to claim 1, characterized in that, The positioning roller (2) is equipped with a positioning plate (31), which is located below the outer expansion plate (33). The positioning plate (31) and the synchronizing rod (3) are connected through each other. A fixing plate (311) is installed on the synchronizing rod (3), which is located below the positioning plate (31). A reset spring (312) is sleeved on the synchronizing rod (3). One end of the reset spring (312) is engaged with the positioning plate (31), and the other end is engaged with the fixing plate (311). The reset spring (312) is in a compressed state and is used to squeeze the synchronizing rod (3) to slide towards the center of rotation.

7. A thermal transfer label printer according to claim 5, characterized in that, A connecting frame (321) is installed on the side wall of the guide plate (32). The guide plate (32) and the connecting frame (321) form an L-shaped angle, and the guide plate (32) is in a horizontal state. The connecting frame (321) is connected to the mounting plate (224). A ball bearing (322) is installed at the bottom of the synchronizing rod (3). The bottom of the ball bearing (322) is slidably connected to the surface of the guide plate (32).

8. A thermal transfer label printer according to claim 1, characterized in that, Several pairs of pressure plates (333) are installed on the synchronous rod (3). Each pressure plate (333) has a rocker arm (332) rotatably installed at its bottom. The rocker arm (332) is in an inclined state. A rod (331) is rotatably installed at the end of the rocker arm (332). The rod (331) moves through the side wall of the positioning roller (2). The end of the rod (331) is connected to the side wall of the outer expansion plate (33). The outer side wall of the outer expansion plate (33) is arc-shaped.

9. A thermal transfer label printer according to claim 1, characterized in that, The positioning roller (2) is equipped with a partition plate (342). A liquid cavity (343) is formed between the top of the partition plate (342) and the top wall of the positioning roller (2). The liquid cavity (343) is filled with water. The elastic cloth bag (344) is connected to the liquid cavity (343). A connecting rib (345) is installed between the positioning roller (2) and the elastic cloth bag (344) to improve the connection strength. A piston (341) is slidably arranged inside the liquid cavity (343). The piston (341) is used to compress water. A pull rod (34) is installed at the center of the piston (341). The pull rod (34) is movably connected to the partition plate (342). The bottom of the pull rod (34) is connected to the synchronizing rod (3).

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